JP2002178689A - Duplex writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a duplex writing implement which can be operated while a writing posture is kept during writing without separating the implement temporarily from a paper surface when one pen body protruded from the tip opening of a barrel is retracted, and the other pen body is protruded for writing. SOLUTION: Cam followers 22A and 2B are formed in side parts, two refills 2A and 2B sprung forward by springs 6 and housed in the barrel 1, and a rotary cam 3 is arranged rotatably between the barrel and a front opening 5 which are connected through a joint 4 while being exposed to the outside. When the rotary cam is rotated, one refill is retracted, and the other refill is advanced so that the pen bodies 21A and 21B are protruded from the tip opening 51 of the front opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double writing instrument in which two refills are accommodated in a shaft cylinder.

[0002]

2. Description of the Related Art A plurality of ballpoint pen refills and mechanical pencils with different ink colors are accommodated in a barrel, and the pen body of each refill or mechanical pencil is selectively projected from an opening at the tip of the barrel. The double-type writing implement for writing by hand has a function of a plurality of writing implements with one writing implement, so that it is extremely convenient for carrying and the like, and many of them are put to practical use.

[0003] As a method of selectively projecting a plurality of refills or a pen body of a mechanical pencil housed in a shaft cylinder from an opening at the tip of the shaft cylinder, a rotary feeding type and a knock type are known. In the rotary feed-out type, two ball-point pen refills, which are usually different in ink, are housed in a shaft cylinder composed of a front shaft and a rear shaft. The pen is protruded from the tip opening of the barrel while the refill moves forward, and the other refill is retracted and the pen body is immersed in the barrel. Many on the other hand,
In the knock type, each actuator attached to the tail end of a plurality of refills protrudes radially annularly from the side wall of the rear end of the barrel, and knocks and advances the operator of the refill to be written. And, while retracting the refill that the pen body has already protruded from the tip opening of the barrel,
The pen body of the refill to be written protrudes from the opening at the tip of the barrel, and this knock-type double-type writing instrument is widely used.

[0004]

As described above, in order to immerse the pen body protruding from the opening at the tip of the shaft cylinder and protrude the other pen body for writing, in the rotary feeding type dual writing implement, It is necessary to rotate the front shaft and the rear shaft relatively with both hands. In the knock-type double-type writing instrument, the knocking operation can be performed with one hand. However, in order to perform the knocking operation during writing, it is necessary to re-grip the writing instrument. In other words, even in the rotary feeding type compound writing instrument and in the knock type compound writing instrument, for example, when switching to writing with red ink while writing with blue ink, the pen body protruding from the tip opening of the shaft cylinder is used. In order to immerse and penetrate the other pen body for writing, it is necessary to temporarily operate the writing implement away from the paper surface, and it is necessary to interrupt the writing for a relatively long time.

Accordingly, the present invention eliminates the need to temporarily separate the writing instrument from the paper when writing a pen body projecting from the tip end opening of the barrel during writing and projecting another pen body. An object of the present invention is to provide a double-type writing instrument that can operate a writing instrument in a writing posture.

[0006]

In order to achieve the above object, a double writing instrument according to the present invention has a cam follower formed on a side portion, and accommodates two refills, which are repelled forward by a spring, in a shaft cylinder. A rotating cam having a cam profile with which the cam follower abuts is rotatably disposed between a barrel connected through a joint and a leading end in a state exposed to the outside, and when the rotating cam is rotated, The refill moves backward, and the other refill moves forward so that the pen body protrudes from the front end opening of the front end to enable writing.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the same. In FIGS. 1 and 2, a pen barrel 21A, 21B is provided at a tip in a barrel 1 made of synthetic resin. Two ballpoint pen refills 2A and 2B respectively are accommodated so as to be able to move back and forth. The ballpoint pen refills 2A and 2B are filled with inks of different colors, for example, blue ink and red ink, respectively, and are repelled forward by a spring 6. Also,
Cam followers 22A and 22B are integrally formed on the sides of the ballpoint pen refills 2A and 2B, respectively.

[0008] The joint 4 is a cylindrical body, the side of which
Two slits 41 for projecting the cam followers 22A and 22B are formed so as to face each other in the vertical direction. Threads 42 and 43 are formed at both ends of the joint 4, and the shaft cylinder 1 and the front end 5 having a tip opening 51 are screwed and connected to the thread grooves 42 and 43. A cylindrical rotary cam 3 is loosely fitted to a joint 4 between the barrel 1 and the front end 5. As described above, the rotary cam 3 is rotatably disposed between the shaft cylinder 1 and the front end 5 connected via the joint 4, that is, in a state where the rotary cam 3 is exposed to the outside at the position where the fingertip abuts during writing.

The cam followers 22A, 22B of the ballpoint pen refills 2A, 2B are
1 and abuts against the cam profile 31 of the rotary cam 3 in a state of being repelled by the spring 6.
The cam profile 31 has an arc portion 31a orthogonal to the axis.
And an inclined portion 31b cut diagonally. Arc part 31
The angle of a is 180 ° or more, and the cam follower 22A
And 22B can simultaneously contact the arc portion 31a. The lower end of the inclined portion 31b is the locking portion 32. The locking portion 32 is formed by cutting a lower portion of a vertical portion 33 following one end of the arc portion 31a in a lateral direction so as to have a substantially U-shape. Reference numeral 22B abuts against the inclined portion 31b, enters the engaging portion 32 along the inclination thereof and is engaged therewith, and receives pen pressure. In the drawings, the cam profile 31 is shown so as to be visible from the outside. However, in actuality, the cam profile 31 is formed inside the cylindrical rotary cam 3, and the cam profile 31 is formed.
1 and the cam followers 22A and 22B are invisible from the outside.

When the cam followers 22A and 22B are simultaneously in contact with the arc portion 31a, as shown in FIG.
Both the pen bodies 21A and 21B are immersed in the front opening 5.
Then, when starting writing, when writing with the pen body 21B, the rotating cam 3 is slightly rotated clockwise with respect to the writing implement in the writing posture. Thereby, the cam follower 22B
Is separated from the arc portion 31a of the cam profile 31, descends along the vertical portion 33, enters the locking portion 32 and is locked as described above. At this time, as shown in FIG.
The pen body 21B protrudes from the front end opening 51 of the front end 5 to enable writing. On the other hand, the cam follower 22A is
1a. In addition, when starting writing, when writing with the pen body 21A, the rotating cam 3 is rotated counterclockwise. As a result, the cam follower 22A shifts from the arc portion 31a of the cam profile 31 to the inclined portion 31b, enters the locking portion 32 with the rotation of the rotary cam 3, and is locked. It becomes possible to write out protruding from. Meanwhile, Cam Follower 22B
Remains in contact with the arc 31a.

Next, during writing, the pen bodies 21A, 21B
Is changed, the rotary cam 3 is rotated clockwise. When any of the pen bodies 21A and 21B protrudes from the front end opening 51 of the front opening 5, the rotary cam 3 cannot be rotated counterclockwise. By rotating the rotary cam 3 clockwise, the cam follower 22A locked on the locking portion 32
Or 22B retreats along the inclined portion 31b of the cam profile 31 and moves to the circular arc portion 31a, and the pen body 21
A or 21B is immersed in the front opening 5. On the other hand, the cam follower 22B or 22A of the pen body 21B or 21A immersed in the front opening 5 is separated from the arc portion 31a of the cam profile 31, descends along the vertical portion 33, and enters the locking portion 32. The pen body 21 </ b> B or 21 </ b> A is locked and protrudes from the front end opening 51 of the front end 5 to enable writing. That is, the pen bodies 21A and 21B can be switched by rotating the rotary cam 3 rightward with the fingertip.
At this time, since the rotating cam 3 is located at the portion where the fingertip comes into contact during writing, it is not necessary to separate the writing implement from the paper surface and re-grip the rotating implement, and the rotating cam 3 can be rotated with the writing implement in the writing posture. Therefore, it is possible to write by changing the pen body without interrupting the writing.

[0012]

As described above, the compound writing instrument of the present invention has a cam follower formed on the side and accommodates two refills which are repelled forward by a spring in a shaft cylinder.
A rotating cam having a cam profile with which a cam follower abuts is rotatably disposed between a barrel connected through a joint and a leading end in a state of being exposed to the outside, and when the rotating cam is rotated, one of the refills Is retracted, and the other refill moves forward so that the pen body protrudes from the front end opening of the front end, so that the pen body protruding from the front end opening of the barrel (front end) is immersed during writing. When writing with the other pen body protruding, it is not necessary to temporarily separate the writing implement from the paper surface, it is possible to operate the writing implement in the writing posture, and it is possible to operate the writing implement with almost no interruption of writing. can do.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the embodiment of the present invention.

FIG. 3 is an explanatory diagram of an operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2A, 2B Refill 21A, 21B Pen body 22A, 22B Cam follower 3 Rotating cam 31 Cam profile 32 Locking part 33 Vertical part 4 Joint 41 Slit 5 Front end 51 Tip opening 6 Spring

Claims (1)

[Claims] 1. A cam follower is formed on a side portion, and two refills repelled forward by a spring are housed in a barrel, and a rotary cam having a cam profile against which the cam follower abuts is used to form a joint. When the rotary cam is rotated, one of the refills is retracted, and the other refill is advanced and the pen is moved between the shaft cylinder and the front end which are connected through the shaft. A dual-purpose writing implement characterized in that the body protrudes from the tip opening of the front end and can be written.